For the longest time, I always thought the Fraggles were like terrorists to the Doozers.  They would run in, eat parts of their buildings (which looked like they were made out of clear K-nex, and never had walls or floors), then run away.
     Recently, when watching the first episode of Fraggle Rock ever, which I of course own, my fears were alleviated.  In that episodes, Fraggles nab some infrastructure and start gnawing down.  In the process of doing so, the Doozers come out.  Instead of being offended or scared, the head Doozer simply says, "It's nice to see people appreciate good architecture."
     Let your concerns be thus laid aside.  =)